MESO: Mesoscale Discussion 2456

ACUS11 KWNS 112356
SWOMCD
SPC MCD 112356
MEZ000-MAZ000-NHZ000-VTZ000-CTZ000-NYZ000-NJZ000-PAZ000-120400-

MESOSCALE DISCUSSION 2456
NWS STORM PREDICTION CENTER NORMAN OK
0556 PM CST THU DEC 11 2008

AREAS AFFECTED...PARTS OF THE CATSKILL MTNS NEWD INTO ERN MAINE

CONCERNING...FREEZING RAIN

VALID 112356Z - 120400Z

A SIGNIFICANT FREEZING RAIN EPISODE WILL CONTINUE ACROSS PARTS OF
THE CATSKILL MTNS EXTENDING NEWD TO ERN MAINE FROM 00-06Z.
PRECIPITATION RATES WILL GENERALLY BE IN THE 0.02-0.05 INCH/HR OVER
PARTS OF MAINE WITH MORE INTENSE RATES OF 0.10-0.20 INCH/HR PROBABLE
OVER PARTS OF NY EXTENDING INTO SRN PARTS OF NEW ENGLAND.

SURFACE OBSERVATIONS THIS AFTERNOON ACROSS PARTS OF NERN PA
EXTENDING INTO SRN COASTAL MAINE HAVE INDICATED LIQUID EQUIVALENT
PRECIPITATION RATES FROM 0.02-0.10 INCH/HR. THIS WILL LIKELY
CONTINUE AS RECENT RADAR MOSAIC SHOWS AN EXPANSIVE PRECIPITATION
SHIELD MOVING NWD FROM PARTS OF THE MID-ATLANTIC INTO SRN NEW
ENGLAND. STRONG WARM AIR ADVECTION IN THE 925-700MB LAYER WILL
SUPPORT STRONG MOISTURE FLUX AND ISENTROPIC LIFT IN THE REGION THIS
EVENING. MODEL FORECAST SOUNDINGS RETAIN A NEAR-SURFACE LAYER AOB
32 F DEG ACROSS MOST OF THE HIGHLIGHTED AREA THROUGH 06Z WHICH WILL
LEAD TO SIGNIFICANT ICING. AREAS INITIALLY RECEIVING SNOW ACROSS
PARTS OF NRN VT/NH WILL EVENTUALLY TRANSITION TO SLEET/FREEZING
RAIN.

..SMITH.. 12/11/2008

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.

ATTN...WFO...CAR...GYX...BOX...BTV...OKX...ALY...PHI...BGM...
CTP...

LAT...LON 42347223 42027306 41597364 41327411 41297502 41307570
41477628 41907634 42517548 42977477 43427325 44217146
45127012 45656903 45706812 45446740 45216724 44796719
44466757 44296848 43626996 42867090 42347223

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